SIMPLE DESIGN OF FILTER BANKS FOR SUBBAND ADAPTIVE FILTERING

Subband adaptive filtering is an important applica­ tion of filter banks in which maximally decimated filter banks can not be used in general because of decimation aliasing effects. This leads to the use of oversampling schemes in the filter bank design wherein the perfect­ reconstruction (PR) or near PR property is still required. In this work, a simple design technique for uniform DFf filter bank with near PR property is presented for the purpose of subband adaptive filtering. The prototype filter in the proposed filter banks can be obtained simply by performing an interpolation of a two-channel QMF filter. The filter bank design technique presented in this paper is of particular interest in engineering applica­ tions, as demonstrated by design examples.